Die for making pinking-cutters



No.- 623,602. Patented Apr. 25, I399. H. A. HANNUM.

DIE FOR MAKING PINKING QUTTERS.

(Application filed May 25, 1898.)

(No Model.)

INVENTOR A zi mw 4; ATTORNEY fiwiiiiw NITED STATES HENRY A. HANNUM, OF OAZENOVIA, NEW YORK.

DIE FOR MAKING PlNKlNG-CUTTERS.

SPECIFICATION forming part of Letters Patent No. 623,602, dated April 25, 1899.

Application filed May 25, 1898. Serial No. 681,715. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. HANNUM, a citizen of the United States, and a resident of Oazenovia, in the county of Madison, in the State of New York, have invented new and useful Improvements in Dies for Making Pink ing-Cutters, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to a circular cutter specially designed to form on the edge of the material operated on scallops having notched edges.

The object of the invention is to provide a cutter which shall perform the aforesaid function in an efficient and perfect manner and shall be manufactured expeditiously and at a minimum cost of labor and material; and to that end the invention consists in the novel construction of dies by means of which the cutter is formed,as hereinafter described, and set forth in the claim.

In the annexed drawings, Figure 1 is a plan view of the cutter. Fig. 2 is an edge view of the same. Fig. 3 is an enlarged edge view of a portion of the cutter, showing the shape of the cutting edge at the junction of two arches. Fig. 4: is a transverse sectional view of the dies by means of which the required shape is imparted to the cutter. Fig. 5 is a plan view of a strip of-clot-h, showing the cffeet of the cutter; and Fig. 6 is a fragmentary side view of the aforesaid dies.

to represents the circular cutter, which is formed of a disk of steel, the marginal portion of which is bent into successive arches a, extending around the periphery of the disk and provided with a continuous laterally-zigzagged cutting edge, which may be formed by filing or milling V-shaped notches alternately in opposite sides of the disk. However, this manner of forming said cutting edge requires the disk to be of considerable thickness, which renders the aforesaid bending'of the disk more difficult. To obviate this, I prefer to form the cutter of a thin disk and crimp the marginal portion thereof radially, as shown at 0. and subsequently sharpen the edges of the crimps.

In manufacturing said cutter I proceed as I follows: I stamp a disk of the requisite di- I then place said anieter out of sheet-steel.

press, by means of which the marginal portion of the disk is bent into successive arches a! disk, and simultaneously with said bending the dies cl dcrimp the marginal portion of the disk, as shown at c To facilitate said shap ing of the disk, it may be introduced in a suitable heated condition between the dies. After the disk has been thus shaped and removed from the dies and cooled I bevel the edges of the crimps, preferably by means of an emery-wheel having a V-shaped peripheral face, against which the successive edges of the crimps are held. In this manner I form on the periphery of the disk a continuous laterally-deflected zigzag cutting edge extending in successive arches around the periphery of the disk.

To enable the dies 01 d to stamp the crimps in the arches a at the deepest portions thereof, I form the creases in the corresponding portions of the faces of the dies with vertical sides 0 0 adjacent to the arches, and thereby produce the vertical cuts 0 0. (Shown in Fig. 5 of the drawings.) This peculiar shaping of the vertical sides 0 o of the creases in the dies is the salient feature of my invention, as I have found it to be the only form which permits the crimped cutter to be struck up into its requisite shape by means of dies of a drop-press. What I claim is As a means for forming the within-described cutter, drop-press dies of circular form and having the marginal portions curved in the shape of successive arches, and provided with successive V-shaped creases extending radially part way from the peripheries of the dies, and the creases in the sides of the deepest parts of the arches formed with the vertical sides c 0 adjacent to the arches to form on the cutter a zigzag edge which is capable of being subsequently sharpened, as set forth.

. HENRY A. HANNUM.

Witnesses:

J. J. LAASS, H. B. SMITH. 

